Impacts of Renewable Energy on Transient and Voltage Stability of Electric Power Systems

稳定是电力系统安全运行的基本前提。随着负荷需求的不断增加和输电网络的老化，世界范围内电力系统的运行条件越来越接近其稳定极限。与此同时，可再生能源的集成度也在不断提高。特别是，加拿大在各种可再生能源的生产和使用方面处于世界领先地位。尽管可再生能源带来了许多好处，但它们也给电力系统的稳定性带来了新的挑战。例如，风力涡轮机和光伏发电机对扰动的不同动态响应可能会加剧突发事件，从而恶化整个电网的稳定性。在可预见的未来，随着可再生能源普及率的不断提高，为了提高现代低碳电力系统的稳定性和可靠性，研究不同可再生能源对电力系统各种稳定特性的影响势在必行。 这项研究计划旨在研究可再生能源的随机性对电力系统暂态和电压稳定性的影响，这些影响尚未得到很好的认识和解决。事实上，可再生能源的变化性可能会影响暂态稳定的稳定区域，降低电压稳定裕度。此外，拟议的研究计划将开发分析和计算工具，对整合可再生能源的系统进行稳定性分析，并进一步设计控制措施，以提高这些系统的稳定性。从理论上讲，这一研究项目将把先进的非线性系统理论的概念运用到电力系统中，并通过结合随机性来扩展现有的结果，甚至根据自己的权利产生新的理论结果。从实用的角度来看，研究成果将为系统运营者评估和提高现实世界中并网可再生能源系统的稳定性提供物理见解、量化措施和计算工具。研究成果将推动可再生能源与电网的无缝集成，这不仅在加拿大，而且在全球范围内都在倡导。将在该项目中接受培训的四名研究生将为加拿大电力行业的未来做出贡献。特别是，魁北克在水电开发方面在世界舞台上享有盛誉，目前处于将大量风力发电整合到其电网中的研究前沿。在这方面，研究计划的目标符合当地行业的利益，该研究计划的成果将在不久的将来产生与行业合作伙伴的各种合作机会。

Stability is a fundamental premise for secure operation of every electric power system. As the loading demands are constantly increasing and the transmission networks are aging, the operating conditions of worldwide power systems have been pushed ever closer to their stability limits. Meanwhile, the integration of renewable energy sources has been constantly increasing. Particularly, Canada is a world leader in the production and use of all kinds of renewable energy. Although renewables bring numerous benefits, they also pose new challenges to power system stability. For example, the distinct dynamic responses of wind turbines and photovoltaic generators to disturbances may aggravate the contingencies, and thus deteriorate the stability of the overall power grid. As the penetration of renewables continues to increase in the foreseeable future, it is imperative to study the impacts of different renewables on various power system stability properties in order to enhance the stability and reliability of modern low carbon power systems. This research program intends to examine the impacts of the randomness of renewables on transient and voltage stability of electric power systems, which have not been well recognized and addressed. Indeed, the variability of renewables may affect the stability regions for transient stability and reduce the voltage stability margins. In addition, the proposed research program will develop analytical and computational tools to conduct stability analysis for the systems integrating renewables, and furthermore design control measures to enhance the stability of those systems. From the theoretical perspective, this research program will exploit concepts from advanced nonlinear system theory in the context of power systems, and extend the existing results by incorporating stochasticity and even produce novel theoretical results in their own rights. From the practical view point, the research outcomes will provide physical insights, quantitative measures and computational tools to system operators on evaluating and enhancing the stability of power systems integrating renewables in the real world. The research outcomes will advance seamless integration of renewable energy sources into power grids, which is advocated not only in Canada but also globally. The four graduate students to be trained in this program will be well-equipped to contribute to the future of the Canadian power industry. In particular, Quebec has developed a solid reputation on the world stage in hydro-electric development, and is now at the forefront of research on integrating significant amounts of wind power into its grid. In this regard, the goals of the research program comply with the interests of local industries, and the outcomes of this research program will generate various collaboration opportunities with industry partners in the near future.